a while back i had this idea: we've had dogs that fight with bladed weapons held in their mouth (repede, koromaru, sif, zacian), so why not a horse? thus SWORD HORSE was born.
thistlemane, better known as sword horse, is a stoic wandering warrior who wields the powerful Thoroughblade. their swordsmanship (swordhorseship?) is nearly unmatched, and they've dispatched countless foes on their endless quest for justice. though he's capable of speech, it's hard to get any words out of him unless you really earn his respect. the truth of her quest is a secret she keeps to herself...
in my MASKS tabletop campaign, sword horse is a recurring character and a member of the golden guardians (the universe equivalent to the avengers or the justice league). one of the PCs stole their sword and gave it to another NPC and they're rightfully pissed off about that.